It helps position your camera securely on the tripod head. The quick release lock prevents the camera from falling. The quick release lock also allows for easy attachment and removal of the camera. Compatible with digital, 35mm, medium format cameras, video cameras, binoculars, and scopes. Includes a 1/4 inch -20 threaded camera screw and video pin. A quick release plate can be attached to the camera's base, enabling fast and simple mounting or detachment from the tripod without adjusting the threaded mount. Compatible with: PH-368 (PH368) -686 (CX686) C-600 (C600) D-600 (D600) -870RM (VCT870RM) Bottom interface size: 6.8 x 6.2 cm Color: Black Material: ABS Package Contents: 1 x QB-6RL Quick Release Plate Note: Light and display differences may cause slight variations in color between the image and the actual item. Measurement may vary by +/- 1-3 cm.